Geographic variation in leaf trichome of wild radish （ Raphanus sativus L. var. raphanistroides Makino ） in Japan
Geographic variation in leaf trichome of wild radish （ Raphanus sativus L. var. raphanistroides Makino ） in Japan
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日本野萝卜 (Raphanus sativus L. var. raphanistroides Makino) 叶毛的地理变异
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
H. Setoguchi
中科院分区：
文献类型：
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作者：
Qingxiang Han;S. Sakaguchi;H. Setoguchi
了解野生萝卜叶毛的地理变异有助于阐明形态变异是如何通过自然选择塑造的。在这里，我们调查的地理变异的野生萝卜种群覆盖琉球群岛和大陆。同时，我们还探讨了叶毛多态性的进化和维持过程中可能存在的选择压力。结果表明，叶毛密度在整个日本列岛前，与植物从南部岛屿人口往往表现出无毛的叶子，而那些北方日本大陆完全覆盖着浓密的毛状体野生萝卜是高度可变的。日本野萝卜种群中的这种毛状体变异可能归因于外部压力，涉及保护免受霜冻和对食草动物的抵抗。本研究将有助于了解不同选择条件下野生萝卜的形态变异，为萝卜的育种和进化研究提供理论依据。
Understanding the geographic variation of leaf trichome in wild radish accessions would help to elucidate how morphological variation can be molded by natural selection. Here, we investigated the geographic variation of leaf trichomes in wild radish populations across Japan covering Ryukyu Islands and mainland. And we also sought the possible selection pressures involved in the evolution and maintenance of leaf trichome polymorphism. Results showed leaf trichome density in wild radish was highly variable across the Japanese archipel-ago, with plants from southern insular populations tending to exhibit glabrous leaves, while those of northern mainland Japan were completely covered by dense trichomes. This trichome variation in Japanese populations of wild radish was probably attributing to external stress involving in protecting against frost damage and resistance to herbivores. This study will be helpful to understand the morphological variation under divergent selections in wild radish and contribute to the areas of breeding and evolutionary studies in radish.